Sound-reproducing apparatus



H. II. SANDELL. SOUND REPRODUCING'APPARAWS. APPLICATION FILED OCT. 3y 1919. lQAGS.

I WNW* I I IIIUIINUII .I IWI III.Is IIII .,.IIIIIIIIU HHH u u H III IIIIIIIIIIIH .x MM II j reproducing needle or stylus UNITED STATES HENRY K. SANDELL, OF CHICAGO, ILLINOIS.

SOUND-REPRODUCING APPARATUS.

Application led October 3, 1919.

To allie/1.0m tmc-jy co neem i e it known that I, HENRY K. SANDnLL. a citizen of the United States, residing at 221 Sout-h Green street, Chicago, in the County of Cook and State of Illinois, have invented a new and useful Improvement in Sound-Reproducing Apparatus, of which the following is a specification.

The present invention relates to apparatus for reproducing sounds, and more particularly to apparatus wherein a plurality ot' vibratory,diaphragms may be actuated independently and simultaneously by a single to produce different series of sound waves.

An apparatus embodying the present invention is illustrated in the accompanying drawings, in which` igure 1 is a` side elevation, partially in section, of a device constructed in accordance with the present invention.

Fig. 2 is an end elevation, partly in section on line 2 2 of Fig. l of the reproducing mechanism, the parts thereof embodying the iaphragm supports not being shown;

Fig. 3 is a vertical Section on the line 3*?) of Fig. 1,' and Fig. 4 is a plan view of the amplifiers, being taken in section through the conduits leading thereto.

In my application for patent, tiled Oct. 3d, 1919, Serial No. 328,230, I have dcscribed a sound record formed with a groove the bottom of which is formed with waves of the hill and dale type` recording a succession of sound waves, and the side of which are formed with lateral waves, recording independently a different succession of sound waves. In the form'ot' construction illustrated in the drawings it is assumed that the sound waves recorded upon such a record are to be reproduced.

Referring more particularly tothe drawings, the numeral 10 indicates a support or table' through which passes ay rotatable shaft 11 carrying a flat table 12 upon which rests the Sound record 13 containing record grooves of the type described. The snaft 11 may be rotated byA any suitable means, not shown.

The reproducing stylus is carried by oscillatable arniA 14, the "mounting of which will be hereinatter described; j Its end 15, which swings over the record 1'13, is suit-ably formed t carry the pivotally'mounted lplate or lever e ement 16. This' plate rests upon hori- Specication of Letters Patent.

Patented Dec. 6, 1921. seri-a1 No. 328,229.

zontally spaced pivot pins 17, 17 and is retained movably in position upon said pins by helical springs 18 interposed between the said plate and the heads ot screws 19, 19. Plate 16 is thus capable of oscillation relative to the 'end 1.3 of arm 14 about a horizontal axis or fulcrum, the line .joining pivotl pins 17, 17.

Upon the plate 16 is mounted a plate or lever element 20 tor the stylus, this plate resting on two vertically spaced pivot pins 21, 21 which project from the plate 16. Plate 2() is retained movably in position by helical springs 22, interposed between the plate 2O and the heads of screws 23, 23, which pass through suit-able openings in plate 20 to plate 16. Suitable openings 24, 25 may be provided in plate 20 to permit free pa `sage ot' the heads of screws 19, 19. Plate 2, is, as is readily apparent, capable of oscillatory or rocking movement relative to plate 16 and to the. end 15 of arm 14 about the fulcrum line joining' pivot pins 21, 21 as a vertical axis. The stylus support 26 projects forwardly and slightly downwardly from plate 20, stylus 27 being retained therein by any suitable means, such as set screw 28.

The movements of plates 16 and 2l are transmitted to the'diaphragms of separate sound boxes, for example, as follows: The plates 16 and 21 may be providedv respectively with tongues 29 and 30, tongue 29 projecting vertically from plate 16 and tongue 30 projecting horizontally from plate 21. From tongue 29 a vibration transmitting member 31, which may be, for example, a wire 31, extends to diaphragm'32 of sound. box 33, being attached thereto at an acute.

angle preferably less than 45. In the de 37, which may also suitand 39. Conduit section 38 is journaled on the downward opening of the curved conduit section 40 and conduit section 39 is journaled on the upwardly projecting coupling 34 of the fitting 42. The arm 14, together with the sound boxes 33 and 36 are hence cii'iable ot oscillating about the vertical axis ol conduit sections 38 and 39.

The curved conduit section 4l() is coni'iected to a rearwardly projecting coupling i.lil ot' fitting l2. Fitting l2 is rotatably journaled at its ends in elbows a4 andpl, and ispron vided internally with a partition lo so arranged that the waves issuing troni sound hox u2-3 through conduit el() pass out through elhow 4l and those .issuing trom sound hos. 3o pass out through elbow l5. lllbows All and Ll5 communicate respcctivelyY with the ends lo and 47 o' the twin horns or ainplitiers 4H and ii9. The elhous land lll are supported in position by flanges fil), lllsuitably attached to the support 10. lt is readily apparent trom the coiistruction described that the arm lll is capable ol a. limited vertital oscillation, together with the sound boxes 33 and 3G and the associated fittings.

ln the operation ol the device ot the present device in conjunction with a sound record 13 mounted upon the table 1Q and having a record groove, the bottoni ot `which. has a vertical wave conformation andthe sides ot which have a lateral Wave' conformation, it is apparent that the vertical Waves ol' the bottoni oli the groove will produce oscillations ol plate 16 about its vertical asis, therehy actuating diaphragm 32 and withoutatliecting diaphragm 35. Similarly, the lateral waves ot the sides of the record groove will produce oscillations of plate 2O about its vertical axis, thereby actuating diaphragm 35 Without atlecting diaphragm B2. AFor accurate operation it is preferred that the point ot attachment of transmission Wire 31 to plate 16 be collinear with the axis ol. oscillation ot' plate 16 and that ot attachment ot transmission member 3l to plate 20 he collinear with the axis of oscillation of plate 16.

It is furthermore apparent that the present reproducer may he used Without change of position in conjunction with records containing grooves of the usual hill and dale type or with those containing grooves ot the vertical Wave type, one diaphragm only reinsee-os spending to the vilnatory7 movement ot the needle or stylus produced in each case.

ln order that the sounds issuing from either or both amplifiers may be modulated or controlled at iv ill, dainpers 50, 5l) may be inserted in conduits leading thereto. rl`hese muy he regulated independently to secure any desired modulation ot the sounds issuing trom the ainplitiers.

Although the present invention has been described and embodied in a particular torni ot apparatus, it is .not intended that the dctails ot construction. and operation set torth shall. be regarded as limitations upon the scope olfl the invention., except in so tar as included in the accompanying claims.

l claim:

l. ln sound re )reducing apparatus. a support, a lover mounted thereupon 'tor oscilla.- tion about a horizontal axis, a sound producing diaphragm, a link connecting the lever to the diaphragm, a second lever mounted upon the first mentioned lever tor oscillation therewith about its horizontal tulcruni-luit oscillatable relatively thereto about a vertical axis, a second sound pro ducing diaphragm, a link connecting the second lever to the second diaphragm, and a stjvlus holder rigidly connected with the second lever.

9.. ln sound reproducing apparatus, a support, a lever mounted thereupon for osoillation about a horizontal anis, sound -producing diaphragm, a linltconnecting the lever to the diaphragm, a second lever mount4 ed on the li rst mentioned lever lor oscillation. therewith about its horizontal tulcrum but oscillataliile relatively thereto about a -vertical axis, said vertical axis passing through the point ot connection ot' the above mentioned link, a second sound producing diaphragm, a link connecting the second lever to the second diaphragm, the point ol connection ot the said link being alined. with the horizontal axis of the irst mentioned lever, a. stylus holder rigidlj)I connect-ed with the second lever.

narrar saliente, 

